Help finding magneto for craftsman rife on mower

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Hi.
I can't figure out what magneto I need for my craftsman yts3000 ride on mower.
Model 917.289140
21hp briggs platinum xrd engine #143.008501

I believe it's made by Tecumseh but there are no labels saying so. The research I've done trying to find the correct part and part number has only led to more confusion. There are so many out there I have no clue what to order.

As always thank you. The info I've gotten from you pros who know way more than me has been invaluable.
 
The confusion is you are claiming to have a Briggs engine but the 143.008501 is a Tecumseh number not Briggs. If you actually have the Briggs engine the model type and code of the engine should be stamped into the valve cover. Sears claims that mower used the 331877-1449-G1 but need to confirm.

If everything above checks out then I am assuming that your need the ignition module since you have lost spark Part number 799650 supercede to 595304
 
I haven't lost spark. I charge the battery and it dies in about a day. The thing is just not charging. The engine has the briggs label on it but it's built by Tecumseh. Here's a pic of the info on the mower and the top of the engine.
Thanks for the reply.
Oh. It's a 21hp if that helps
 

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I'm sorry. I should have added this info

Craftsman lawn tractor
Yts 3000
Model # 917.289140
540cc, 21hp briggs platinum xrd Engine # 143.008501
 
The last info with the model and engine number came from under the seat. I don't have a picture of that. I can get one tomorrow if needed.
Thank you again.
 
You definitely have a Briggs and not a Tecumseh engine. The 143.008501 is a horizontal shaft Tecumseh HM85-155851B and it would not even fit in place of the vertical shaft Briggs.

As IL said look on the rocker cover (refer to as a valve cover) for the model, type, and date code.
 
I will take a look as soon as I get to my shop and post what the valve cover says.

The sticker under the seat with the numbers I gave you was there when I bought it. I'm guessing some one other than the factory put it on to mess with who ever owned it or worked on it next.

Thank you for helping me figure this out. I would never get this straight without your help.
 
Model: 331877 or l33L877
Type code1449 61 100309zd

I don't think it needs a magneto. I put the meter on it while running and it's charging like it should. The issue is the battery will loose cranking amps after a couple of days and it won't start the mower unless I jump or recharge it. The battery is 3 months old but it's seen alot of cranking the starter with a no start condition. That has been fixed. Question.

Could I have killed the battery by trying to start it when it won't start?
Could it be solenoid and how do I test the solenoid?


When the battery is fully charged the mower starts up on the second or third cycle. What am I missing here?
 
If it takes 2-3 cycles to start I would be checking to make sure the choke is fully closing. If the engine cranks then nothing wrong with the solenoid. Now as far as the battery. Excessive cranking could of damaged the battery but you could also have an issue with the battery being faulty and self discharging or you could have a parasitic load that is draining the battery. Since you say it is charging being over 13 volts then after using the mower disconnect the negative battery terminal. And the next time you want to start it reconnect and see what happens. If it is stilled charged then I would be doing further electric checks on the mower to find the short. If the battery is dead after being disconnected then you have our answer about the battery being faulty.
 
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